JPH09132378A - Lift-up hook device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the manipulatability and safety. SOLUTION: A hook 14 is rotatably coupled to a hook support 12 in a condition such that the hook support 12 is interposed between stationary pieces, so as to constitute a hook device 10. A locking member 18 having a locking pawl 20 is swingably arranged between the locking pieces of the hook 14 so that the locking member 18 is made into slidable contact with a sliding part 30 of the hook 14. A slide part 30 is formed therein with a recess 32 for holding a hook device 10 in a closed condition, a recess 36 for holding the same in an open condition, and a recess for holding the same in an intermediate condition. The side wall 34a of the recess 34 is formed as an inclined surface so as to inhibit the hook support 12 and the hook 14 from being relatively rotated in the opening direction when the hook device while it allows them to relatively rotate in a closing direction in accordance with an external force. Further, the locking member 18 is swung through the intermediary of a protrusion 22 formed at the front end of the locking member 18 so that the locking pawl 20 is selectively engaged in one of the recesses 32, 34, 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting hook device used for lifting heavy objects such as iron plates and blocks.

[0002]

2. Description of the Related Art Conventionally, at a construction site or the like, when a heavy work such as an iron plate or a block body is hoisted and conveyed by a crane, the hoisting has a fall prevention function to ensure the safety of the work. Hook device (hereinafter,
Workpieces are transported using a hook device.

As a hook device of this type, for example, the upper end of the hook is rotatably supported by an intermediate portion of a hook support having a wire fixing portion for locking a wire of a crane at the upper end, and the tip of the hook and the hook are supported. A hook device has been proposed in which, when the hook device in which the tip of the support member is in contact with the hook device is in the closed state, relative rotation between the hook support member and the hook is prevented and the closed state can be maintained (JP-A-6- No. 92587).

In this hook device, the hook is locked to the iron plate or the like by inserting the hook into the perforated portion formed at the end of the iron plate or the like, and the hook device is closed to rotate the hook support member and the relative rotation of the hook. By preventing the above, it is possible to reliably prevent the work from falling off from the hook device during conveyance.

In this hook device, an engaging piece is rotatably supported near the wire fixing portion of the hook supporting body, and an engaged portion is engageable with the engaging piece on the hook. Is provided, and when the hook device is rotated approximately 180 ° from the closed state of the hook device to bring the back part of the hook into contact with the hook support body, the locking piece is attached to the locked part in the opened state of the hook device. By engaging the hook device, the open state of the hook device can be maintained. That is, after the work is transported, the hook device is lifted by the crane while keeping the hook device in the open state, so that the work of removing the hook device from the work can be easily performed.

[0006]

However, in the above-mentioned conventional hook device, in the work of removing the hook device from the work, first, the release lever is operated to release the hook device from the closed state, and the hook is rotated about 180 °. It is necessary to rotate the hook device to hold the hook device in the open state and engage the locking piece with the locked part. To hold the hook device in the open state, operate the release lever and operate the locking piece. However, the operability is not always good. Therefore, improvement of this point is desired.

Further, in the above-mentioned conventional hook device, since the engaging piece and the locked portion are projected from the side surface of the hook device, the engaging piece and the like are put on clothes of the worker during work. There is a risk of being caught, which is not preferable in terms of work safety. Moreover, since the above-mentioned engaging piece is rotatably supported by the side portion of the hook support pair, there is also the complexity that the engaging piece swings during the work and interferes with the work.

The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a lifting hook device capable of further improving operability and safety.

[0009]

According to a first aspect of the present invention, there is provided a hook device for hoisting, comprising a hook support having a wire fixing portion at a rear end thereof, and a rear end rotatably attached to an intermediate portion of the hook support. In a hook device provided with a hook to be supported, and a restricting means for restricting relative rotation of the hook support body and a supporting shaft of the hook, the restricting means is pivotally supported by the hook. A stop member, an arcuate sliding contact portion formed on the hook support member and capable of sliding contact with the locking member according to relative rotation of the hook support member, and the locking member, the sliding contact portion. A biasing member for urging the locking member and an operating means for swinging the locking member, and the sliding contact portion is engaged with the locking member to support the hook tip and the hook support. With the hook device in contact with the body tip, close the hook and hook support. A first engaging portion that prevents relative rotation of the body, and a second engagement portion that prevents relative rotation of the hook and the hook support body in an opened state of the hook device in which the hook tip and the hook support body tip are separated from each other most. A joint portion and a third engagement portion which is between the closed state and the opened state and blocks only relative rotation of the hook and the hook support member in the direction of the opened state, These engaging portions are provided continuously to the sliding contact portion.

According to this hook device, the hooking member is swung by the operating means so that the hooking member is selectively engaged with each engaging portion provided on the sliding contact portion. The device is held closed, open, or in between. Therefore, it is possible to change the hook device to each of the above states by operating one operation means in a series of work transfer operations such as a work of locking the hook device to the work and a work of removing the hook device from the work. The operability of is improved.

A lifting hook device according to a second aspect is the lifting hook device according to the first aspect, wherein a rear end of the hook has a bifurcated structure having a pair of fixing pieces, and between the fixing pieces. The hook is pivotally supported by the hook support with the hook support interposed in the space, and the locking member and the sliding contact portion are arranged in the space between the fixing pieces. .

According to this hook device, since the locking member and the engaging portion are disposed in the space between the pair of fixing pieces provided at the rear end of the hook and are difficult to be exposed to the outside, the locking member and the like are provided. It has never been caught on the worker's clothes or the like, or the locking member did not interfere with the work. Therefore, safety and workability at the time of work can be improved more.

[0013]

Embodiments of the present invention will be described with reference to the drawings. 1 and 2 show an embodiment of a lifting hook device according to the present invention. As shown in these drawings, a lifting hook device 10 (hereinafter, abbreviated as a hook device 10) is a hook support body provided with a wire fixing portion 16 at a rear end (upper end) for locking a wire or the like of a crane. 12 and a hook 14 that is rotatably supported on an intermediate portion of the hook support 12.

As shown in FIG.
A pair of fixing pieces 15a and 15b are integrally provided on the upper end thereof. Then, with the hook support 12 interposed between the fixing pieces 15a and 15b, both fixing pieces 15a and 15b
By inserting the shaft body 17 over the a and 15b and the hook support body 12, the hook 14 can freely rotate on the hook support body 12. To be precise, the hook support body 12 and the hook 14 are relatively arranged around the shaft body 17. It is rotatably connected.

On the hook 14, the fixing piece 15a,
A locking member 18 is arranged at a position below the hook support 12 between 15b. This locking member 18
Is a substantially L-shaped member having a locking claw 20 on the upper end side (upper right side in FIG. 2), and is attached to a shaft body 24 that is laid across the fixing pieces 15a and 15b. The shaft body 2 is swingably supported around the body 24 and
The locking claw 20 is moved by the spring force of the torsion coil spring 28 inserted into the hook supporting body 12 into the sliding portion 30 described later.
It is urged to press against.

As shown in FIG. 2, the lower end of the tip of the engaging member 18 projects outwardly from the hook 14 between the fixing pieces 15a and 15b, and the protruding portion 22 extends in the width direction of the hook 14 (see FIG. 2). 22a extending in the direction (perpendicular to the paper surface)
Is provided. In the present embodiment, the projecting size of the projection 22a is set to be appropriately longer than the size of the hook support 12 in the width direction and not to project outside the fixing pieces 15a and 15b.

On the other hand, the hook supporting body 12 is integrally formed with an arcuate sliding portion 30 centered on the shaft body 17 at a connecting portion with the hook 14.

The sliding portion 30 is a portion where the locking member 18 is in sliding contact with the relative rotation of the hook support 12 and the hook 14, and the sliding portion 30 has the locking member 18 therein.
The hook support 12 by interposing the locking claw 20 of
And the recesses 32, 34, 3 for restricting relative rotation of the hook 14
6 are provided in this order from the tip side of the hook support 12.

More specifically, the recess 32 (first
2 is a closed state of the hook device 10 in which the tip of the hook 14 and the tip of the hook support body 12 are in contact, that is, FIG.
The locking claw 20 is provided so as to intervene in the state shown by the solid line. By thus interposing the locking claw 20 in the recess 32, the hook support in the opening direction of the hook support 12 and the hook 14, that is, in the direction in which the tip of the hook 14 and the tip of the hook support 12 are separated from each other. Body 1
The relative rotation between the hook 2 and the hook 14 is prevented, so that the hook device 10 is kept closed.

The recess 36 (second engaging portion) is opened so that the tip of the hook 14 and the tip of the hook support 12 are separated from each other so that the wire fixing portion 16 abuts on the back of the hook 14. State (position indicated by the chain double-dashed line in the figure)
The locking claw 20 is provided so as to intervene. By interposing the locking claw 20 in the recess 36 in this manner, relative rotation of the hook support body 12 and the hook 14 in the closing direction (the direction opposite to the opening direction) is prevented, whereby the hook device 10 is provided. Is kept open.

On the other hand, the concave portion 34 (third engaging portion) is
The sliding portion 30 is formed between the concave portion 32 and the concave portion 36, and the hook 14 and the hook support 12 are in an intermediate state in which the hook 14 and the hook supporting body 12 are appropriately rotated in the closing direction (the position indicated by the dashed line in the figure). ), The locking claw 20 is provided so as to intervene. By interposing the locking claw 20 in the recess 34 in this way, the relative rotation of the hook 14 and the hook support body 12 in the closing direction and the opening direction is both prevented, whereby the hook device 10 is kept in the intermediate state. It is supposed to be.

However, in the recess 34, the side wall 34a on the side of the recess 32 is formed into an inclined surface as shown in the same figure, so that when an external force of a certain value or more acts, the locking claw 20 separates from the recess 34. Then, it can be moved to the concave portion 32 side. That is, in the intermediate state of the hook device 10, the relative rotation of the hook support 12 and the hook 14 in the opening direction is prevented, while the hook support 12 and the hook 14 are closed in the closing direction according to an external force of a predetermined value or more. Relative rotation is allowed.

Next, the function and effect of the hook device 10 configured as described above will be described with reference to FIGS.

When the work B such as an iron plate is hoisted and conveyed by using the hook device 10, first, the wire W of the crane is connected to the wire fixing portion 1 through a shackle or the like.
By locking the hook device 10 to the wire W
Attach to

Then, the locking member 18 is swung to move it to the position shown in FIG.
The hook device 10 is held in the intermediate state as shown in FIG. At this time, after the hook 14 and the hook support 12 are relatively rotated while pressing the protruding portion 22 of the locking member 18 to separate the locking claw 20 from the sliding portion 30, the locking is performed. The hook device 10 can be set in an intermediate state by interposing the claw 20 in the recess 34.

In this state, as shown in the figure, the tip of the hook 14 is inserted into the perforated portion Ba of the work B and inserted between the work B and the ground to complete the preparation for hoisting the work B by the hook device 10. . At this time, the hook device 10 is in the intermediate state as described above, and the hook support 12
Since relative rotation of the hook and the hook 14 in the opening direction is blocked, for example, the weight of the wire fixing portion 16 or the wire W
And the weight of the shackle causes the hook support 12 to rotate in the opening direction with respect to the hook 14, and the locking claw 20 is interposed in the recess 36, whereby the hook device 10 is unexpectedly held in the open state. Absent.

Then, the wire W is driven by driving the crane.
When the winding of the work is started, as shown in FIG.
The hook support 12 and the hook 14 relatively rotate in the closing direction from the intermediate position by the weight of, and the hook 14 bites into the perforated portion Ba as the work B becomes vertical and rises.

When the work B is completely lifted in this way, as shown in FIG. 5, the hook 14 is completely inserted into the perforated portion Ba of the work B and the engaging claw 20 is interposed in the recess 32. As a result, the relative rotation of the hook support 12 and the hook 14 in the opening direction is blocked, and the hook device 10 is kept in the closed state. Then, the work B is hoisted and conveyed by the crane while the hook device 10 is kept in the closed state,
The work B is transported while reliably preventing the work B from falling off the hook 14.

After the work B is conveyed to the intended place, the work B is placed on the ground and the hook device 10 is removed from the work B, whereby the work B carrying work using the hook device 10 is completed. . In this case, the protruding portion 22 is pressed to swing the locking member 18, whereby the locking claw 20 is separated from the sliding portion 30, and the hook 14 and the hook support 12 are relatively rotated in the opening direction. After that, the hook device 10 can be removed from the work B by pulling out the hook 14 from the perforated portion Ba of the work B.

However, when the work B is placed on the ground in a prone posture at a target place, as shown in FIG. 6, the work 14 is buried in the ground with the lower part of the hook 14 being the base of the work B. In some cases, the hook device 10 cannot be easily removed from the work B.

In this case, the projecting portion 22 is pressed to swing the locking member 18 so that the locking claw 20 is separated from the sliding portion 30, and in this state, the hook 14 and the hook support body. The hook device 10 is set in the open state by rotating the 12 relatively in the opening direction and interposing the locking claw 20 in the recess 36 as shown in FIG. 7. And then
The hook device 10 can be easily removed from the work B by winding the wire W by driving the crane and pulling down the hook device 10.

That is, when the hook device 10 is open,
As described above, since the locking claw 20 is interposed in the recess 36 to prevent the relative rotation of the hook support 12 and the hook 14 in the closing direction, when the hook device 10 is pulled up, it is indicated by an arrow in FIG. As a result, the entire hook device 10 rotates, so that the hook 14 is pulled out from the perforated portion Ba of the work B.

By removing the hook device 10 from the work B by the power of the crane used to convey the work B in this manner, the hook device can be easily removed even in the above-described situation where it is difficult to remove it by the force of the operator. 10 can be removed from the work B.

When switching the detached hook device 10 from the open state to another state, as shown in FIG. 7, the locking member 18 is swung through the protrusion 22a, particularly the protrusion 22a. The hook support 12 has a protruding portion 2
Even when the upper part of 2 is covered, the locking member 18 can be easily rocked.

As described above, the hook device 10 is used.
According to this, the locking claw 20 is selectively engaged with each of the recesses 32, 34, 36 formed in the sliding portion 30 of the hook 14 by the swinging operation of the locking member 18 via the protruding portion 22. As a result, the hook device 10 is held in the closed state, the open state, and the intermediate state, respectively. Therefore, a series of work such as the work of locking the hook device 10 to the work and the work of removing the hook device 10 from the work are performed. In the transfer operation, the locking member 18 is inserted through the protruding portion 22.
The hook device 10 can be switched to each of the above states simply by swinging. Therefore, when the hook device is detached from the work, the operability of the hook device 10 is improved more than that of the conventional hook device of this type that requires the operation of the release lever and the swing operation of the locking piece. be able to.

Moreover, the sliding portion 3 having the recesses 32, 34 and 36 for switching the holding state of the hook device 10 is formed.
0 and the locking member 18 are all arranged in the space between the pair of fixing pieces 15a and 15b provided on the upper end of the hook 14, so that clothes of a worker are caught on these members during work. Or, the locking member 18 or the like does not get in the way during the work. Therefore, as compared with the conventional hook device of this type in which the engaging piece and the locked portion for holding the hook device in the open state are provided on the surface of the hook support body or the hook, the safety during work and Workability can be improved better.

The hook device 10 is an example of the lifting hook device according to the present invention, and its specific structure can be appropriately changed without departing from the gist of the present invention.

For example, in the hook device 10 of the above embodiment, the protruding portion 22 is provided at the tip of the locking member 18,
Although the locking member 18 is rockably operated by the operator pressing the protruding portion 22, the locking member 18 is rocked as shown in FIGS. You may make it employ | adopt such a structure. That is, instead of providing the protruding portion 22 on the locking member 18, the locking member 18 and the shaft body 24 are integrally rotatably coupled to each other, and the shaft body 24 is projected to the side portion of the hook 14 to form the protruding portion. The lever 42 may be attached, and the locking member 18 may be integrally swung via the shaft body 24 in accordance with the swing operation of the lever 42. With such a configuration, even when the hook device 10 is in the opened state, the locking member 18 can be easily rocked on the side portion of the hook 14, and when the hook device 10 is switched from the opened state to another state. Operability can be further enhanced.

[0039]

As described above, according to the present invention,
By swinging the locking member by the operating means and selectively engaging the locking member with each of the engaging portions provided on the sliding contact portion, the hook device is closed, opened, or Since the regulation means for regulating the relative rotation of the hook support body and the hook is configured so as to hold the hook device in a state between the two, a series of work such as the work of locking the hook device to the work and the work of removing the hook device from the work In the carrying operation, the hook device can be changed to each of the above states by operating one operating means. Therefore, when the hook device is detached from the work, the operability of the hook device is improved more than the conventional hook device of this type which requires the operation of the release lever and the swing operation of the locking piece. be able to.

Particularly, the rear end of the hook has a bifurcated structure having a pair of fixing pieces, and the hook is pivotally supported on the hook supporting body with the hook supporting body interposed in the space between these fixing pieces. If the locking member and the sliding contact portion are arranged in the space of each fixing piece, the locking member and the engaging portion are hard to be exposed to the outside, so that the locking member and the like are caught on the worker's clothes and the like. And the locking member does not interfere with the work.
Therefore, the safety and workability during work can be improved more.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a lifting hook device according to the present invention.

FIG. 2 is a cross-sectional view showing the hook device.

FIG. 3 is a schematic view showing a usage state of the hook device (a step of hooking a hook tip on a perforated portion of a work).

FIG. 4 is a schematic view showing a usage state of the hook device (a state immediately after starting lifting of a work).

FIG. 5 is a schematic view showing a use state of the hook device (a state in which a work is completely lifted).

FIG. 6 is a schematic view showing a usage state of the hook device (a state in which the work is placed on the ground after the work is conveyed).

FIG. 7 is a schematic view showing a usage state of the hook device (a state immediately before the hook device is removed from the work).

FIG. 8 is a perspective view showing another embodiment of the lifting hook device according to the present invention.

FIG. 9 is a cross-sectional view showing the hook device.

[Explanation of symbols]

 10 Hook Device 12 Hook Support 14 Hook 16 Wire Fixing Part 17, 24 Shaft 18 Locking Member 20 Locking Claw 22 Projecting Part 22a Projection 26 Shaft 28 Torsion Coil Spring 30 Sliding Part 32, 34, 36 Recess 34a Side wall

Claims (2)

[Claims] 1. A hook support having a wire fixing portion at a rear end thereof, a hook having a rear end rotatably supported by an intermediate portion of the hook support, and the hook support and a support shaft for the hook. In a hook device provided with a restricting means for restricting relative rotation around the hook, the restricting means is formed on the hook support body and a locking member pivotally supported by the hook, and the hook support body is provided. An arc-shaped sliding contact portion capable of sliding contact with the locking member in accordance with relative rotation of the hook support member, a biasing member that biases the locking member toward the sliding contact portion, and the locking member In the closed state of the hook device in which the hook tip and the hook support tip are brought into contact with each other in the sliding contact portion by engaging with the locking member. And a first engaging portion for preventing relative rotation of the hook support and the hook tip. A second engaging portion that prevents relative rotation of the hook and the hook support in the open state of the hook device in which the end and the tip of the hook support are most separated from each other; and a state between the closed state and the open state. And a third engaging portion that prevents only relative rotation of the hook and the hook supporting member in the direction of the open state, and these engaging portions are provided continuously to the sliding contact portion. A hook device for lifting, which is characterized in that 2. The rear end of the hook has a bifurcated structure having a pair of fixing pieces, and the hook is pivotally supported on the hook supporting body with the hook supporting body interposed in a space between the fixing pieces. The lifting hook device according to claim 1, wherein the locking member and the sliding contact portion are disposed in a space between the fixing pieces.